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hoisting operations together with the cable cutter which
provides for quick release of the paid out cable and hook
in event of emergency. On those aircraft provided with
pulley block assemblies having pins as shown in (fig.
4-3-9 Sheet 1 of 2), the following instruments apply:
When the hoisting system is reeved as shown in (fig.
4-3-9 Sheet 2 of 2), the pins and their retaining hardware
are to be installed only if the cable makes a wrap angle
of 180 or more around the pulley. When not in use, the
pins and their retaining hardware are to be stowed in the
container provided for hoist accessories.
WARNING
To prevent dangerous electrical shock to
personnel being hoisted, the cable must
touch the ground or water prior to contacting
personnel.
4-3-6. Static Line Retriever.
A static line retriever is provided with the static line anchor
cable (fig. 4-3-11). The retriever is used to haul static
lines into the helicopter at the completion of a paradrop
mission and can also be used to haul in a paratrooper
hung up on a static line. The static line anchor cable and
retriever are installed and operated as follows:
a. Install the anchor cable between sta 120 and
592.
NOTE
Do not allow the cable to sag more than 6
inches.
b. Plug the cable cutter into the auxiliary control
panel at sta 95 and move the speed selector on the winch
to CARGO.
c. Plug the winch control grip into the power receptacle
at sta 502 on the left side.
d. Reeve the winch cable through a pulley attached
to a 5,000-pound tiedown fitting at sta 140, buttline 20 left
and then through another pulley attached at sta 120.
buttline 18 left (fig. 4-3-11).
e. Reel out enough cable to allow the cable to rest
on the floor and out of the way of personnel. Attach quickdisconnect
and cover guard to the winch cable.
f. When the static lines are ready to be retrieved,
reel out additional cable and attach the retriever to the
winch cable. Reel in sufficient cable; then disconnect the
static lines from the anchor cable.
4-3-7. Triple Cargo Hook System.
Three external cargo hooks are provided for attaching
external cargo. The hooks can be used with a single load
on one hook, two hooks in tandem (forward and aft
hooks), or individual loads on three hooks. The tandem
hook configuration provides improved load stability at
higher airspeeds. With the triple hook system, up to three
loads can be deposited at different locations during a
single mission. The forward hook is at sta 249. The center
hook is at sta 331. The aft hook is at sta 409.
All hooks have normal release modes, emergency release
modes, and manual release modes. Normal release
mode can be controlled by both pilots or by the
hoist operator. Emergency release of all hooks can be
performed electrically by either pilot or manually by the
crew member.
CAUTION
Do not lift or rotate the center cargo hook
into the cabin area or allow the mid hook
to lay on the cargo floor or access door
panel during inspection or use. The excessive
tension placed on the triple emergency
release cable housing assembly may
partially dislodge the housing and engage
or activate the forward and aft hook emergency
release mechanism. This may
cause an inadvertent release of loaded
forward and aft hook assemblies in flight.
4-3-8. Center Cargo Hook.
The position of the center cargo hook is such that the load
is suspended beneath the CG of the helicopter at sta 331.
TM 1-1520-240-10
4-3-14
The hook assembly consists of a hook, hydraulic actuator,
and a release mechanism. The hook is suspended by
means of a beam which is mounted inside the rescue
hatch. This beam rotates within its mounting supports for
longitudinal swing. The hook pivots about its attachment
bolt for lateral swing. The cargo hook system is normally
operated hydraulically by pressure from the utility hydraulicsystem.
In the event of a loss in utility system
pressure, the cargo hook can be opened pneumatically
or manually. The cargo hook contains a spring-tensioned
keeper which prevents accidental loss of cargo through
slippage of the sling rings. When not in use, the cargo
hook can be removed from the hatch since both the electrical
and hydraulic lines are equipped with quick-disconnectors
or the cargo hook can be stowed. The cargo hook
and beam assembly must be removed for rescue operations
through the hatch.
4-3-9. Center Cargo Hook Loading Pole.
WARNING
Make sure the ground cable is connected.
With the rotors turning, static potential between
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